Vacuum-jet.



I. L. DAVENPUHT.

VACUUM J'ET.

MPUCAHON man MARA 3x. 1915.

1,180,017. Patented Apr. 18, 1916 2 SHEETS-SHEET 2.

THOMAS L. DAVENPORT, OF vEVIIIICRIFJT'.'|'., WASHINGTON.

VACUUM-J' ET.

Specication of Letters Patent.

Patented Apr. 18, 1916.

Application led March 31, 1915.` Sera1No. 18,312.

To all whom it may concern Be it knownthat l, THOMAS L. DAVEN- PORT, citizen of the United States, residing at Everett, in the county of Snohomish and State of Washingtomhhave .invented a certain new and useful Improvement in Vacuum-Jets, of which the following is a specication.

My invention relates to improvements in vacuum-jet pumping systems andthe object of my improvement is to provide a vacuumjet pumping system which shall embody a plurality of vacuum-jet pumps and `conduits, together with controlling valves that are adapted to operate conjointlycand automatically to control and regulate the flow of fluid in such conduits, whereby the supply of fluid under pressure for operating such system shall at all times be proportionate to the efective work-thereof, and a further object of my improvement is to provide a vacuum-jet pumping system that shall be adapted for use in a building in removing dirt and dust from the rooms of such building to a desired place of disposal and that shall be further adapted to operate to create a greater power of suction than has been possible in vacuum-jet pumping systems heretofore employed whereby conduits of a given cross-sectional area shall have greater capacity. I accomplish these objects by devices illustrated in the accompanying drawings wherein Figure 1 is aview in vertical mid-section of a structure embodying the operative parts of my invention; Fig.,2 is a view'pf the same in horizontal cross-section on broken line of Fig. l.; Fig. '3 is a view of the same in horizontal cross-section on -lnroken line y, g/ of Fig. 1; a'nd Fig. 4 is a view in vertical mid-section of certainparts of Ia modified form of my invention some other parts being shown by a view in side elevation. Y

Referring to the drawings, throughout which like reference numerals indicate like parts, 5 is a conduit pipe, which may be extended to a convenient place of deposit of matter forced to flow therethrough, tothe upper screw-threaded end of which A'conduit pipe 5 is connected the internally screwthreaded lower end of a cylindrically formed vacuum-jet 6 to whose upper internally screw-threaded end is cori'nectedthe externally` screw-threaded lower end of another vacuum-jet 7 whose upper in ternally screwthreaded end is connected with the lower externally screw-threaded end of a vacuum-` jet qcomprising a lower part 8 and an upper part 9, the upper internally screw-threaded end of which part 8 is connected with the lower externally screw-threaded end of said part 9.

Projecting from the periphery ofthe part 9 of the uppermost vacuum-jet is a boss 10 and extending through said boss 10 and the wall of the part 9 is a screw-threaded hole into which is' screwed one end of a 'supply pipe 11 through which steam, compressed air or liquid under' pressure may find its way into the part 9 of said uppermost vacuum-jet where it is receivedwithin an annular space 21 wlich extends around the wall of a tube 12 that is concentrically disposed to project downwardly fromvthe top vrall of the part 9 of which it is an integral .part and which tubev 12 has its bottom end provided with an externally beveled portion which terminates with itsbeveled surface disposed near -to and concentrically with a corresponding internally beveled surface of the throat of the main passageway 13 that yextends downwardly through the part 8 of the uppermost vacuum-jet, the walls of which passageway 13 form a tube 14 shaped like the frustum of a cone, and the lower large end of such tube 14 is likewise provided with an externally beveled portion which terminates with 'its beveled surface. dlsposed near to and concentrically7 with the internally beveled throat of the main passageway 15 A that extends downwardly through the vacuum-jet 7 the walls of which passageway 15 form a similar but larger` tapered tube 16 whose lower larger end is likewise provided with an externally bevieled portion which terminates with its beveled surface disposed near to and concentrically with the linternally beveled throat of the passageway 171formed by the larger tapered walls of the vacuum-jet 6 whose lower end connects with the conduit pipe 5- as illustrated in Fig. 1.

The tubes 14 and16 are supported in their concentric positions within their respective vacuum-jets by means of integral wheellike spokes 18, as more clearly-indicated by Fig. 3, whereby they are surrounded by annular lspaces 19 `and` 20, respectively, which annular spaces 19 and 20 communicate with the annular space 21 thus to permit tiuidI under pressure to flow from the pipe 11 to supplyY such fluid tothe annular spaces 21, 19 and 2O from which annular spaces such fluid may grain access into the main passageways 13, 15 and 175 through the space between the beveled surfaces at the adjacent ends of the respective ones of the three vacuum-jets, to be directed down wardly with great relocitY into the conduit pipe 5 thus tending to create a vacuum within the passagewayY that extends through the tube 12 of the upper part 9 or. the Lippen most vacuunrjet.

An important feature' of my invention consists in constructing; the leifel-al vacuumjets so that when they are joined together then the passageways lil. 15' and 17 shall constitute a continuous passageway that increases at a constant rate in .itsA diameter between th inlet cnil of the uoersnost vz'lciiuxn-j4t and the outlet end of the huwen most one of said vacunnrji i shown Fig. l there :raming i i eurri-vnts oi" fluid that otherlr '.'1

as for instante, if.n the walls of suffi; passati,

way he diverged at an inconstant angie.

The passageway extending upfiardlfv" through the tube 12 communica with the interior chamber 30 of a (.fheck-if'alve 22 whose externally screuvthreaded lower end portion is screwed into the top wall of the upper part. of the uppermost vacuum-jet and uflioseiipper end is provided with a screw-threaded hole within which is screwed. an annular bushing; whose lower end por tion projects downwardly within the chamber 30 at' the Check-valve where it is formed to eng-age with the beveled surface of a valremembcr 24 whereby the passage4 way through said bushing 23 may be inaintained normally closed in response-to the force of a helical spring 25 that is disposed to surround the ValYe-stein 2li which valvestein l is an integral part of the valve fili and which i" liliaiily disposed within a cou- =entrically sposa-,d socket il? that is wupported in courentrisi'. position by webs 2S, 'f 'r ore e earlj'.' Shown in Fig. nto the upper l wf the bushing: i'i screwed a conduit p1 i? which may he extended to connect i tu one or more conduit pipes through which air is to he sueled. To the'outer end of the pipe l1 is'conneeted the outlet end 31 of a globe-valve 32 whose inlet end El?) is connected to a 4supply pipe 34 leading to a source of fluid under pressure. and interposed within said supply pipe 34 is a strainer 35 comprising a disk of perforated heet metal or wire netting clamped between two fianged members-36 and 3T of coru'aro-con\'ex form, as shown "in Fig. l.l which strainer 35 may vent ohstruvtive matter from being carriel into the glolww'alrc li and its associated \':u,uuin-jcts.

The globe-valve 32 embodies a he veled serve to pre.-I

valve member 38 whiirli mounted on a spindle 39' that is disposed to extend upwardlrY from the globe-valve 32 into a bored cylinderf) whose bottom end is screwed into the top side of the globe-rake 32 and whose top endis open, and mounted on said spindle lilik 5h which air the" upper a Vacuum gage 45 ee of minus pipe 29 and i ont r ol" said pi Le; may in/limite the preseure within the senda t within the cylinder elf?. a

Tie operation of my invention vas ernlmdied in the ruotare illustrated by Figs. 1, i), f rilievi ae folio-Ns: The conduit pipe il?? being; as of ted with a system of conduit pipes. th\ou`h,which vair is to be sucked to carry anla it the dirt and dust of rooms of ai handing within which s ch system is instailed to deliver such dirt and dust through the del* convenient place of doin it oi" suc-,h matter; ad the pipe iii being extended to connect with a i alive-(fontrollcrl outlet of a supply ot steam or Compressed air, then normally the valve member ill and the faire member 38 are in their i itions, as shown in Fig', 1 w

ka tendency to create a vacuum in the chamher Si) which will cause the valve member 2l to more downwardly against the force of the helical spring 25 to openthe passave- 'way between the pipe 29 and said cham er 2&0 thus to tend to create a vacuum in said pipe 2S) and in the cylinderO. If thework to be done by the system of conduitipipes l spindle rv pipe 5 to a.-v

ureway between 2O of the severall cohnectcd with the pipe 29 .is 'slight then the. tendency to form a vacuum in such systeui and in the cyindcr will be greater with the result that atmospheric pressure i on the top of the piston 41 will move such piston l1 doanwardly 'to decrease the flow of steamiorgcompressed airinto the vacuumiets, and if the intakes of said system of conduit pipes are all closed then such at- .inospheric pressure will cause the 4piston 41 to wholly close the globewalve 32, but if the maximum amount ot work is being effected by said system by reason of all of its intakes being open then the spring 42 will be strong enough to raise the valve member 38 te its highest point. against the atmospheric pressure on the piston 41; thus by the coaction of the. valve members 24 au! 38 the degree of minus pressure in the system ot' conduit pipes and in the cylinder 40 will be automatically regulated to be substantially constant. irrespective of the amount of work being` efi'ected by the s vstem of conduit pipes. and the rate of .flow of compressed air or steam into the several vacuum-jets through the globe-valve 32 will be. aiways proportionate to the amount of work being effected through said system of conduit pipes. The vacuum-gage .'50 may serve to determine the adjustment of the helical springs and 42 which may be supplied with some well known form of devices, not shown, whereby their adjustment may be altered if desired.

AIn Fig. 4 I have shown a modified form rf structure' which differs from the Struct-.lre of Figs. l. and 3 only in respect to the valve controlling mechanism. In Fig. 4

if'. the. dieDie-valve 47, the

and 49 correspond rerduit Vfipa 29, check-- 24 and 38 of lein 26 and the correspond rethe cnf lait pi pe Isc-in 50 and the d in Fig. 4 the valve K :e are operatively they by a levez," 52 pivotally wack-ei ,'33 attached to the outcheck-valve 47, one end of said l M lac-ing articulated to a pin 54 dis l lo extend through the valve-stem 5() the other end of said lever 52 is yieldinpgly articulated with the upwardly mtended portion of the mlve spindle 5l winch 'projects lniwardly through a piston 553 which corresponds to the piston 41 of hier l. Thus by means of Such leve; 52 the valve members 48 and 49 normally operate to more. in unison, in an obvious matr per when the suction through the pipe 4G tends m vary from a desired normal defee by reason of variation in the work being n way. through each of which is of the formr of the frustum of a cone and of a different mean diameter, all of said vacuum-jets being connected together in series so that their combined passageways may form a continuous passageway that shall increase .in its diameter at a constant rate from the inlet end to the outlet end of said series, of a delivery conduit connected to the outlet end of said series of vacuum-jets, a check-valve Whose outletV end is connected tothe inlet end of said series, an intake conduit connected to the inlet end of said check-valve, a fluid supply pipe disposed to adapt lit to conduct fluid under pressureinto the several throats of said vacuum-jets, and automatic means associated with said supply -pipe and with said intake conduit whereby the flow of fluid through said supply pipe shall be varied in response to variations in the minus pressure of fluid within said intake conduit.

2. A vacuum jet pumping system, which embodies aJt/acuum jet; a check-valve whose outlet end'is connected with the inlet end of'said vacuumjet; a suction conduit connected wli'thl the inlet' end of said checkvalve; a ipipe connected with said vacuumjet through which pipe Huid under pressure may be conducted into the throat of said vacuum jet; a valve connected withsaid pipe to control the passage-way through; and a pivota ly supported lever disposed to extend between the valve-stem of said valve and the valvestem ofy said cheek-valve in an articulated relation thereto whereby said valve and said check-valve shall operate synchronously and interdependently.

In witness whereof, I, hereunto subscribe my name this twenty sixth day of M arch A. D., 1915.

O. JoHNsoN, A. HAsKINs.

there. I 

